International Research Journal of Public and Environmental Health
Vol.5 (3),pp. 32-37, March 2018
Available online at https://www.journalissues.org/IRJPEH/
Article 18/ID/JPRH009/06 pages
Author(s) retain the copyright of this article. Author(s) agree that this article remain permanently open access under the terms of the Creative Commons Attribution License 4.0 International License.
Original Research Article
Physico-chemical properties and heavy metals concentration in waste water discharged from two industries in Agbara, Lagos State, Nigeria
Olorunfemi Ogundele1 and Gabriel Olarinde *Mekuleyi2
1Department of Chemistry, Faculty of Sciences, Lagos State University, Nigeria
2Department of Fisheries, Faculty of Sciences, Lagos State University, Nigeria
*Corresponding Author Email : gabrielmekuleyi(at)gmail.com
The present study investigated some of the important physico-chemical parameters such as pH, total dissolved solids(TDS), alkalinity, dissolved oxygen(DO), total hardness, biochemical oxygen demand(BOD), sulphate, nitrate, chemical oxygen demand(COD), phosphate, chloride, and some heavy metals (Cu, Fe and Zn) in industrial effluents collected from Pharma-Deko and Unilever industries in Agbara, Lagos State, Nigeria. Water samples were collected from three stations in each industry and analyzed using standard methods. The average values ±standard error of physico-chemical parameters of the effluents from Pharma-Deko and Unilever respectively are as follow; alkalinity (17.35 ± 0.87mg/L and 22.74 ± 12.76mg/L), pH (5.69 ± 0.43 and 7.53 ± 0.20), chloride (44.45 ± 13.98mg/L and 108.70 ± 57.02mg/L),TDS (82.98 ± 44.67mg/L and 156.75 ± 59.07mg/L), DO (2.86 ± 1.22 mg/L and 1.12 ± 0.49mg/L), total hardness (43.02 ± 30.94mg/L and113.56 ± 89.79mg/L), BOD (260.80 ± 17.38mg/L and 184.80 ± 17.28mg/L), COD (222.56 ± 191.19mg/L and 159.84 ± 61.79mg/L), sulphate (4.57 ± 0.53mg/L and 26.42 ± 1.34mg/L), nitrate (8.31 ± 3.60mg/L and 10.59 ± 3.42mg/L) and phosphate (0.32 ± 0.01mg/L and 0.99 ± 0.10mg/L). The heavy metal concentrations in the waste water from Pharma-Deko and Unilever respectively are copper (0.03 ± 0.01mg/L and 0.06 ± 0.03mg/L), iron (3.45 ± 1.24mg/l and 6.77 ± 5.26 mg/L), and zinc (0.30 ± 0.24 mg/L and 0.24 ± 0.14mg/l). All the physico-chemical properties of the waste water (except COD and DO) examined in the two industries are lower than WHO and USEPA’s maximum permissible limits. Similarly, Zn concentrations in the water sample of both industries as well as Cu concentration in the waste water from Pharma-Deko are below the maximum recommended limit. However, Cu concentration in Unilever waste and Fe concentration in both industries exceeded the maximum recommended limit. The present study has clearly shown that Pharma-Deko and Unilever waste waters had very low level of pollutants as indicated by the physico-chemical properties of the water. However, standard methods of waste water treatment should be maintained by these industries, in order to preclude problems often associated with industrial effluents.
Key words: Industrial effluents, heavy metals, treatment, safety